American Society of Civil Engineers

Effect of Assuming a Logarithmic Flow Profile Near the Bottom on Computing Tide-Residual Sediment Transport

by Tjerk J. Zitman, (Delft University of Technology, Faculty of Civil Engineering, P.O.Box 5048,2600 GA Delft, The Netherlands E-mail:

pp. 1-12, (doi:

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Document type: Conference Proceeding Paper
Part of: Coastal Dynamics 2005: State of the Practice
Abstract: A common assumption in modelling tidal flow in coastal areas is that in the vicinity of the bottom the vertical flow profile attains a logarithmic shape. Some consequences of this type of assumption are studied in the present paper. In a diagnostic setting, the tide-residual transport of sediment is depicted as a function of the thickness of the assumed log-layer. In this respect, the tide is schematised to a combination of the M2 and M4 constituents and the water depth is chosen in a range typical for the shoreface (10–25m). The computational results indicate that assuming a log-layer may lead to an error in the cross-shore transport in the order of 1% of the alongshore transport.

ASCE Subject Headings:
Sediment transport
Tidal currents